First is to use a service like Yahoo Photos and upload your pictures there. Because Yahoo Photos does not allow remote referencing of files on their server, you would have to provide a link at this forum to your photo album.
The other is to upload to a web space that allows remote referencing of the file (these are getting fewer and fewer). Usually, your best bet is to use the web space that is provided to you by your ISP.
Once you have it uploaded, you would reference it here as follows: